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Christoph Hellwig
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import basic uio support code from FreeBSD
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‎build.mak

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@@ -81,6 +81,7 @@ arch/x64/boot32.o: loader.elf
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fs = fs/fs.o bootfs.o
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fs += fs/vfs/main.o \
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fs/vfs/subr_uio.o \
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fs/vfs/vfs_conf.o \
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fs/vfs/vfs_lookup.o \
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fs/vfs/vfs_mount.o \

‎fs/vfs/subr_uio.c

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@@ -0,0 +1,127 @@
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/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "uio.h"
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int
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uiomove(void *cp, int n, struct uio *uio)
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{
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assert(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE);
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while (n > 0 && uio->uio_resid) {
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struct iovec *iov = uio->uio_iov;
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size_t cnt = iov->iov_len;
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if (cnt == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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if (uio->uio_rw == UIO_READ)
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memcpy(iov->iov_base, cp, cnt);
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else
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memcpy(cp, iov->iov_base, cnt);
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iov->iov_base = (char *)iov->iov_base + cnt;
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
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uio->uio_offset += cnt;
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cp = (char *)cp + cnt;
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n -= cnt;
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}
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return 0;
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}
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/*
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* Wrapper for uiomove() that validates the arguments against a known-good
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* kernel buffer. Currently, uiomove accepts a signed (n) argument, which
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* is almost definitely a bad thing, so we catch that here as well. We
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* return a runtime failure, but it might be desirable to generate a runtime
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* assertion failure instead.
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*/
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int
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uiomove_frombuf(void *buf, int buflen, struct uio *uio)
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{
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size_t offset, n;
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if (uio->uio_offset < 0 || uio->uio_resid < 0 ||
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(offset = uio->uio_offset) != uio->uio_offset)
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return (EINVAL);
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if (buflen <= 0 || offset >= buflen)
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return (0);
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if ((n = buflen - offset) > IOSIZE_MAX)
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return (EINVAL);
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return (uiomove((char *)buf + offset, n, uio));
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}
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/*
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* In OSv we don't really copy the iovect in because it lives in the same
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* address space. But keeping this abstraction still allows keeping the
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* checks in one place and eases porting code.
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*/
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int
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copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop)
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{
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struct uio *uio;
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int i;
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*uiop = NULL;
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if (iovcnt > UIO_MAXIOV)
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return (EINVAL);
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uio = malloc(sizeof(*uio));
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uio->uio_iov = iovp;
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uio->uio_iovcnt = iovcnt;
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uio->uio_offset = -1;
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uio->uio_resid = 0;
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for (i = 0; i < iovcnt; i++) {
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if (iovp->iov_len > IOSIZE_MAX - uio->uio_resid) {
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free(uio);
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return (EINVAL);
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}
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uio->uio_resid += iovp->iov_len;
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iovp++;
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}
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*uiop = uio;
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return (0);
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}

‎fs/vfs/uio.h

+59
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@@ -0,0 +1,59 @@
1+
/*-
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* Copyright (c) 1982, 1986, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
7+
* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
10+
* 2. Redistributions in binary form must reproduce the above copyright
11+
* notice, this list of conditions and the following disclaimer in the
12+
* documentation and/or other materials provided with the distribution.
13+
* 4. Neither the name of the University nor the names of its contributors
14+
* may be used to endorse or promote products derived from this software
15+
* without specific prior written permission.
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*
17+
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18+
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20+
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23+
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24+
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25+
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26+
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)uio.h 8.5 (Berkeley) 2/22/94
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* $FreeBSD$
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*/
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#ifndef _UIO_H_
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#define _UIO_H_
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <limits.h>
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enum uio_rw { UIO_READ, UIO_WRITE };
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/*
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* Safe default to prevent possible overflows in user code, otherwise could
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* be SSIZE_T_MAX.
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*/
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#define IOSIZE_MAX INT_MAX
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struct uio {
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struct iovec *uio_iov; /* scatter/gather list */
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int uio_iovcnt; /* length of scatter/gather list */
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off_t uio_offset; /* offset in target object */
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ssize_t uio_resid; /* remaining bytes to process */
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enum uio_rw uio_rw; /* operation */
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};
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int copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop);
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int uiomove(void *cp, int n, struct uio *uio);
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#endif /* !_UIO_H_ */

‎fs/vfs/vnode.h

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@@ -35,6 +35,7 @@
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#include "file.h"
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#include "list.h"
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#include "dirent.h"
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#include "uio.h"
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struct vfsops;
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struct vnops;

‎licenses/ucb+att.txt

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@@ -0,0 +1,35 @@
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/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
4+
* (c) UNIX System Laboratories, Inc.
5+
* All or some portions of this file are derived from material licensed
6+
* to the University of California by American Telephone and Telegraph
7+
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
8+
* the permission of UNIX System Laboratories, Inc.
9+
*
10+
* Redistribution and use in source and binary forms, with or without
11+
* modification, are permitted provided that the following conditions
12+
* are met:
13+
* 1. Redistributions of source code must retain the above copyright
14+
* notice, this list of conditions and the following disclaimer.
15+
* 2. Redistributions in binary form must reproduce the above copyright
16+
* notice, this list of conditions and the following disclaimer in the
17+
* documentation and/or other materials provided with the distribution.
18+
* 4. Neither the name of the University nor the names of its contributors
19+
* may be used to endorse or promote products derived from this software
20+
* without specific prior written permission.
21+
*
22+
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23+
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25+
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28+
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29+
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30+
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31+
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32+
* SUCH DAMAGE.
33+
*
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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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*/

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